Plesiochelyidae were relatively large coastal marine turtles, which inhabited the epicontinental seas of Western Europe during the Late Jurassic. Their fossil record can be tracked in Germany, Switzerland, the United Kingdom, France, Spain and Portugal. The Jura Mountains, in northwestern Switzerland, have been the main source for the study of this group, mostly thanks to the rich and famous historical locality of Solothurn. In the last two decades, numerous plesiochelyid remains have been collected from Kimmeridgian deposits (Lower Virgula Marls and Banné Marls) in the area of Porrentruy (Canton of Jura, Switzerland). This material was revealed by construction works of the A16 Transjurane highway between 2000 and 2011, and led to the recent description of the new species Plesiochelys bigleri. In the years 2014 and 2016, new fragmentary turtle material was collected from the Banné Marls (Reuchenette Formation, lower Kimmeridgian) near the village of Glovelier, Canton of Jura, Switzerland. The new material consists of a complete shell, additional shell elements, a few bones from the appendicular and vertebral skeleton, and a fragmentary basicranium. This material can be confidently assigned to the species P. bigleri. It supports the presence of this species in the Banné Marls, slightly extends its spatial distribution and confirms the differences with the closely related species P. etalloni. The new material reveals that the split between the cerebral and palatine branches of the internal carotid artery occurs in a vertical plane in P. bigleri. This condition could not be observed in the type material due to poor preservation. This new character clearly distinguishes P. bigleri from P. etalloni and seems to be unique among thalassochelydians.

中文翻译：

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来自瑞士西北部早期Kimmeridgian的Plesiochelys bigleri形态的新颖见解

Plesiochelyidae是相对较大的沿海海龟，在侏罗纪晚期居住在西欧的陆上海中。他们的化石记录可以在德国，瑞士，英国，法国，西班牙和葡萄牙追踪。瑞士西北部的侏罗山一直是研究这一群体的主要资源，这主要归功于索洛图恩州丰富而著名的历史名胜。在过去的二十年中，在波伦特鲁伊地区（瑞士汝拉州）的基米第吉安矿床（下维格古拉马尔斯和班内马尔斯）中收集了许多泥石流遗骸。2000年至2011年间，A16 Transjurane高速公路的建筑工程揭示了这种材料，并引起了对新物种Plesiochelys bigleri的最新描述。。2014年和2016年，从瑞士汝拉州格洛维里尔村附近的BannéMarls（Reuchenette组，下Kimmeridgian）收集了新的零碎海龟材料。新材料包括一个完整的外壳，其他外壳元素，一些来自阑尾和椎骨骨架的骨头，以及一个不规则的基础层。这种材料可以放心地分配给P. bigleri物种。它支持该物种在BannéMarls中的存在，稍微扩展其空间分布，并确认与密切相关的物种P. etalloni的差异。新材料表明，颈内动脉的大脑和p动脉分支之间的分裂发生在P. bigleri的垂直平面中。由于保存不良，无法在类型材料中观察到这种情况。这个新角色清楚地将比格里氏疟原虫与埃塔洛尼疟原虫区分开来，并且在海藻纲中似乎是独特的。